CN101529737A

CN101529737A - A method and system for data transmission in a multiple input multiple output (MIMO) system

Info

Publication number: CN101529737A
Application number: CNA2007800386931A
Authority: CN
Inventors: 于茜; 罗平; 星野正幸
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2006-10-18
Filing date: 2007-10-01
Publication date: 2009-09-09
Anticipated expiration: 2027-10-01
Also published as: WO2008045001A8; US20100077275A1; CN101558579A; JP4928613B2; JP2010507326A; CN101558579B; WO2008048188A1; JP2010506547A; US20100100789A1; US8464120B2; JP4914497B2; CN101529737B; US8225168B2; WO2008045001A1

Abstract

A method for data transmission in a multiple input multiple output (MIMO) system, a transmitter in a MIMO system, a computer readable data storage medium having stored thereon computer code means for instructing a MIMO system to execute a method for data transmission in the MIMO system, a method for processing received data in a MIMO system, a receiver in a MIMO system and a computer readable data storage medium having stored thereon computer code means for instructing a MIMO system to execute a method for processing received data in the MIMO system are provided. The method for data transmission comprises receiving multiple input data streams; performing low density parity check (LDPC) encoding of the input data streams utilizing a parity check matrix, wherein the parity check matrix comprises a plurality of sub-parity check matrices for encoding respective associated ones of the input data streams and performing space time encoding for transmitting the LDPC encoded input data streams over a plurality of antennas; wherein the performing of the LDPC encoding of the input data streams comprises generating one or more connection matrices, each connection matrix for injecting information of one of the input data streams into the encoding of another one of the input data streams, and wherein said each connection matrix is a zero matrix if a lowest parity check protection level based on the sub-parity check matrix for said one of the input data streams is equal to or lower than an assigned parity check protection level for said one input data stream, and a non zero matrix otherwise.

Description

The method and system of the transfer of data in multiple-input and multiple-output (MIMO) system

Invention field

The present invention broadly relates to the method for the transfer of data in multiple-input and multiple-output (MIMO) system, relate to the reflector in the mimo system, the computer-readable data storage medium that relates to the computer code of the method that stores the transfer of data in the indication mimo system execution mimo system on it, relate to the method for handling the data that receive in the mimo system, relate to the receiver in the mimo system, and the computer-readable data storage medium that relates to the computer code of the method that stores the data that receive in the indication mimo system execution processing mimo system on it.

Background technology

Wireless communication system has been used to transmit speech business and low data rate non-voice service.Current wireless communication system also can transmit the multimedia service of high data rate, for example, and the business of video, data and other type.Multimedia broadcasting and multicast service (MBMS) channel can be used for transport stream to be used, for example, and the video of radio broadcasting, television broadcasting, film and other type or audio content.

Multimedia broadcasting and multicast service define in the file of the version 6 of third generation partner program (3GPP).Standard TS22.146 has defined the high-level service request of MBMS, and standard TS22.246 has defined typical service scenarios.The MBMS service makes subscriber equipment (UE) (for example, mobile phone or other portable terminal) to receive service from the service supplier by network.MBMS utilizes unidirectional point for example multi-medium datas such as audio frequency, photo, video to be sent to Packet Service (PS) the territory service of a plurality of terminals to multiple spot carrying service.The service usually with block form, at present with the transmission of IP Internet Protocol (IP) block form.Service offers how the control service passes to portable terminal in network radio network controller by the service supplier usually.Radio network controller is determined the service transmission time according to Internet resources and other factors usually.

Because MBMS is a multimedia service, the multiple service of different service quality (QoS) or a plurality of streams of the different QoS in the same service can offer single UE or different a plurality of UE.In addition, the MBMS transmission mechanism need be supported variable source data rate usually.In other words, the transmission digit rate of source data and the error rate (BERs) can change.

Because the MBMS channel is unidirectional, so transmitting base station can not be confirmed any reception mistake at UE.Therefore, need the information protection instrument.

Consider information protection, transmit modulated information signal by radio communication channel and need select proper method to protect information in the modulation signal.These methods can comprise for example coding, symbol repetition, interleaving technology (interleaving) and other known method.

For broadcasting/packet service, the feature of broadcasting/packet service is stipulated by 3GPP MBMS and relevant broadcast/multicast service layer function with requiring.May be required in the data of different content that distribute simultaneously in the MBMS service, and the MBMS that can require a terminal to receive simultaneously more than serves.The MBMS service of transmitting can change, for example, and qos parameter.In the case, need unequal error protection mechanism (UEP) to support to be used in the wireless system the various QoS of the high data rate communication of MBMS service usually.In the following description, have the data that better quality requires and/or require than low rate and be defined as higher priority data, the data that have than low quality requires and/or higher rate requires are defined as low priority data.

Two types method has been applied to UEP.One type comprises the error correcting code of higher priority data being used more powerful routine.Another kind of type comprises that the modulation constellation of using non-uniform spacing or hierarchical modulation are to provide unequal loss protection to the data with different priorities.No. 5105442 United States Patent (USP) has been described coded modulation, and it can be by realizing power efficiency and broadband efficient in conjunction with top two kinds of methods.

No. 5214656 United States Patent (USP) described and finished sign indicating number modulation and the time division multiplexing scheme of compiling in collaboration with.Signal with different priorities is encoded respectively and is modulated.The modulation signal that has different priorities then is mapped to different time slots.

Said method can provide the superperformance of unbalanced data transmission, and still the single transmitting antenna configuration owing to them has limited capacity.

In present technology, multiple-input and multiple-output (MIMO) communication system adopts a plurality of antennas to improve coverage rate, quality and capacity at reflector and/or receiver place.Therefore, a kind of possibility method of increase MBMS power system capacity is to use a plurality of antennas to handle to carry out space-time (ST).Can adopt the notion that the space-time processing is combined with the UEP technology of routine to obtain higher capacity and better quality.

People such as C.H.Kuo are at WCNC 2002, in March, 2002, a kind of method of the UEP that describes in " Robustvideo transmission over wideband wireless channel using space-timecoded OFDM system (using the strong video transmission of the ofdm system of space-time code by broadband wireless channel) " volume of the 3rd volume is included in mimo system cascade forward error correction (FEC) and ST sign indicating number.In the method, provide better robustness for data with higher priority by adopting more powerful FEC.Yet the ST sign indicating number of embedding can not provide difference having between the data of different priorities.Therefore, a problem may occur, and these class methods that unified space-time is handled cascade can not provide further difference having between the data of different priorities, therefore the protection level that can support is limited.Another problem is because for every input data, the space-time code device is to use respectively, is complicated so in fact realize the method.

Still proposed based on other method of different space-time technology being carried out combination for the UEP in the mimo system.For example; see Muhammad Farooq Sabir; Robert W.Heath Jr; and Alan C.Bovik is at the IEEE signal in November, 2002; the 1st volume of the Asilomar meeting of system and computer; people such as " the An unequal error protectionscheme for multiple input multiple output systems (the unequal error protection scheme that is used for multi-input multi-output system) " of 575-579 page or leaf volume and C.H.Kuo rolled up in " Embedded space-time coding for wirelessbroadcast with heterogeneous receivers (being used to have the space-time code of embedding of the radio broadcasting of inhomogeneity receiver) " of the Globecom in November in 2000 2000, the 21 volumes.Yet; because the system requirements of these propositions requires to change the coding structure of space-time code device at each different protection; and when having selected the space-time code device, only can provide special speed and specific protection level, so the flexibility of these systems is low and complexity is high.

For the cascaded code that is used in chnnel coding and the space-time code, provide the turbo sign indicating number that utilizes the iterative decoding technology as the highly reliable channel coding technology that is used for the third generation radio communication of International Mobile Telecommunication 2000 (IMT-2000) standard.The turbo sign indicating number can utilize parallel cascade reponse system convolution (RSC) sign indicating number to carry out encoding operation, and utilizes the iterative decoding technology to carry out decode operation.In addition, if make the size of interleaver very big and fully carry out iterative decoding, then the turbo sign indicating number shows preferable performance aspect BER, near so-called shannon limit.Yet if adopt the turbo sign indicating number, a problem that may occur is possible increase number of operations and cause high complexity.Another problem that may occur is because the size and the iterative decoding number of operations of interleaver all increases, and time-delay may take place and makes real-time difficult treatment.

Except that 3G, the 4th generation wireless communication system develop so that better voice and high-speed multimedia business are provided.In such system, use the channel coding technology that is called low-density checksum (LDPC) sign indicating number.The LDPC sign indicating number is compared with the turbo sign indicating number of routine, has encoding characteristics preferably in complexity and aspect of performance.The LDPC sign indicating number is linear block codes normally, and wherein most of elements of parity matrix (H) are " 0 ".Have been found that then the LDPC sign indicating number can provide preferable performance if use for example probability encoding technology of LDPC.

The LDPC sign indicating number is by the definition of parity check matrix H at random, the number sparse distribution of the element in the matrix " 1 " wherein, and all the other elements all are 0.Parity check matrix H normally is used to judge about the coding of the received signal matrix of correct execution whether.For example, be " 0 " if the received signal by will coding multiply by the value that parity check matrix H obtains, then coding does not have mistake.In the following description, row weighting (perhaps row order number) is determined that by the number of 1 in the row of parity check matrix H row weighting (perhaps row exponent number) is determined by the number of 1 in the row.Unless regulation is described below middle exponent number and refers to the row exponent number in addition.

The LDPC sign indicating number can be described by matrix and factor graph.Can utilize based on the iterative decoding algorithm of sum-product algorithm and in factor graph, the LDPC sign indicating number be decoded.Adopt the decoder Billy of LDPC sign indicating number simple with the decoder of turbo sign indicating number.And the parallel processing decoder can easily be embedded.Therefore, if space-time code device/decoder utilizes the LDPC sign indicating number to carry out the coding/decoding operation, then space-time code device/decoder can have good channel coding/decoding performance.

The method that is used for UEP at present is by realizing the LDPC sign indicating number for chnnel coding.These methods can provide the characteristic of different error protection usually by the difference contact degree that utilizes back end, information bit and parity bit are mapped to the different piece of code word.For example; see that people such as Xiumei Yang is in consumer's communication in 2004 and in January, 2004 of Web conference; 1IEEE 5-8; " New research on unequal error protection (UEP) the property of Irregular LDPC codes (recent studies on of the unequal error protection of abnormal LDPC code (UEP) characteristic) " of 361-363 page or leaf; and PoulliatC; Declercq D., " the Optimization of LDPC codes for UEPchannels (be used for the optimization of the LDPC sign indicating number of UEP channel) " of Fijalkow I. in the 450th page of the Proc.IEEE information theory international symposium (ISITO4) in Illinois, USA Chicago city in June in 2004.For these methods, because the structure of parity matrix structure is in fact very difficult, so the application of LDPC sign indicating number is limited usually.And, owing to can not realize different yardage rates for different information bits, so the performance difference that the position obtained of different stage is very little usually.

In addition; the ieee communication newspaper, in January, 2006, " the New results onunequal error protection using LDPC codes (utilizing the new results of the unequal error protection of LDPC sign indicating number) " of the 10th volume the 1st described another kind of about the method based on LDPC in conjunction with two Tanner figure.Yet, do not further specify in the described file and how to construct piecemeal to generate available parity matrix.

In sum, need support the transmission technology that requires such as the various error protections in the high speed data transfer of MBMS service simultaneously with high system flexibility and low implementation complexity.

Therefore, need the method and system of the transfer of data in a kind of multiple-input and multiple-output (MIMO) system to solve at least one the problems referred to above.

Summary of the invention

According to a first aspect of the invention, provide the method for the transfer of data in multiple-input and multiple-output (MIMO) system, described method comprises a plurality of input traffics of reception; Utilize parity matrix that input traffic is carried out low-density checksum (LDPC) coding, wherein parity matrix comprises a plurality of parity check submatrixs, the parity check submatrix is used for the input traffic input traffic relevant with each parity check submatrix encoded, and carries out the input traffic of space-time code to encode through LDPC by a plurality of antenna emissions; Wherein input traffic is carried out the LDPC coding and comprise the one or more connection matrix of generation; each connection matrix is used for the information of a data flow of input traffic is inserted in the coding of another data flow in the input traffic; wherein; if be equal to or less than the parity check protection level of the distribution of a described input traffic based on the minimum parity check protection level of one parity check submatrix in the described input traffic; then described each connection matrix is a null matrix, otherwise each connection matrix is non-null matrix.

A plurality of input traffics can comprise M inlet flow of M different brackets, and parity matrix can have the M layer, and every layer of parity matrix corresponding to one in M the grade.

Each connection matrix can link the two-layer of M layer, thereby described relevant information between two-layer is inserted into during the LDPC coding.

For each connection matrix, if the parity check protection level of being distributed than the high k level of minimum parity check protection level, then described connection matrix can generate by following steps: matrix is provided

M=r wherein _i, l=n _i, r _iBut be the figure place of the even parity bit of a described input traffic, n _i, be the code word size of a described input traffic, I _m ^(t)Be unit matrix I _mThe shift left operation of t row; Mark C _k=C ^(k)[:, 1:l]; Mark C ' _{I, j}=C ₁+ C ₂+ ... + C _kAnd with C ' _{I, j}Move down (i-1) row and obtain described each connection matrix.

Parity matrix can be the piecemeal lower triangular matrix, and the parity check submatrix is positioned on the leading diagonal of parity matrix as piece.

Connection matrix can be used as the leading diagonal below that piece is positioned at parity matrix, and the piece above leading diagonal is a null matrix.

According to a second aspect of the invention, provide the reflector in many input and output (MIMO) system, described reflector comprises that one or more is used to receive the input unit of a plurality of input traffics; Low-density checksum (LDPC) encoder; The spatial mappings unit; Wherein the LDPC encoder utilizes parity matrix that input traffic is carried out the LDPC coding, described parity check submatrix is used for the described input traffic input traffic relevant with each parity check submatrix encoded,, the input traffic of space-time code to encode through LDPC by a plurality of antenna emissions carried out in the spatial mappings unit; Wherein be that input traffic is carried out the LDPC coding; the LDPC encoder generates one or more connection matrix; each connection matrix is used for the information of a data flow of input traffic is inserted in the coding of another data flow in the input traffic; if and wherein be equal to or less than the parity check protection level of the distribution in this input traffic based on the minimum parity check protection level of the parity check submatrix of a described input traffic; then described each connection matrix is a null matrix, otherwise each connection matrix is non-null matrix.

Many input traffics can comprise M inlet flow of M different brackets, and parity matrix can have the M layer, and every layer of parity matrix corresponding to one in M the grade.

For each connection matrix, if the parity check protection level of distributing than the high k level of minimum parity check protection level, then the LDPC encoder can generate described each connection matrix by following steps: matrix is provided

, m=r wherein _i, l=n _i, r _iBe the figure place of the parity check bit of a described input traffic, n _i, be the code word size of a described input traffic, I _m ^(t)Be unit matrix I _mThe shift left operation of t row; Mark C _k=C ^(k)[:, 1:l]; Mark C ' _{I, j}=C ₁+ C ₂+ ... + C _kWith with C ' _{I, j}Move down (i-1) row and obtain described each connection matrix.

According to a third aspect of the invention we, computer-readable data storage medium is provided, store on it and be used for indicating multiple-input and multiple-output (MIMO) system to carry out the computer code of method of the transfer of data of mimo system, described method comprises and receives a plurality of input traffics; Utilize parity matrix that input traffic is carried out low-density checksum (LDPC) coding, wherein parity matrix comprises a plurality of parity check submatrixs, described parity check submatrix is used for the described input traffic input traffic relevant with each parity check submatrix encoded, and carries out the input traffic of space-time code to encode through LDPC by a plurality of antenna emissions; Wherein input traffic is carried out the LDPC coding and comprise the one or more connection matrix of generation; each connection matrix is used for the information of a data flow of input traffic is inserted in the coding of another data flow in the input traffic; if wherein be equal to or less than the parity check protection level of the distribution of a described input traffic based on the minimum parity check protection level of the parity check submatrix of a described input traffic; then described each connection matrix is a null matrix, otherwise each connection matrix is non-null matrix.

According to a forth aspect of the invention, provide the method for the data flow that receives in processing multiple-input and multiple-output (MIMO) system, described method comprises by a plurality of reception antenna receiving data streams; The data flow that receives is carried out the space-time decoding; The parity matrix that utilization is decoded to data stream, carry out low-density checksum (LDPC) decoding of the data flow that receives, wherein parity matrix comprises a plurality of parity check submatrixs, and the parity check submatrix is used for the receiving data stream receiving data stream relevant with each parity check submatrix encoded; The LDPC decoding of wherein carrying out the data flow that receives comprises uses one or more connection matrix; each connection matrix provides the information of a data flow in the data flow of reception so that another data flow in the data flow that receives is decoded; if wherein be equal to or less than the parity check protection level of the distribution of a described input traffic based on the minimum parity check protection level of the parity check submatrix of a described input traffic; then described each connection matrix is a null matrix, otherwise each connection matrix is non-null matrix.

Described method can also comprise and adopting and long-pending method is decoded to the data flow of described reception.

According to a fifth aspect of the invention, provide the receiver in multiple-input and multiple-output (MIMO) system, described receiver comprises a plurality of reception antennas of receiving data stream; The data flow that receives is carried out the spatial mappings decoder of space-time decoding; And low-density checksum (LDPC) decoder, it utilizes the parity matrix that data stream is decoded that the data flow that receives is decoded, wherein said parity matrix comprises a plurality of parity check submatrixs, and described parity check submatrix is used for the described receiving data stream receiving data stream relevant with each parity check submatrix encoded; Wherein for the LDPC decoding of carrying out the data flow that receives; the LDPC decoder uses one or more connection matrix; each connection matrix is used for providing the information of a data flow of data flow of reception so that another data flow in the data flow that receives is decoded; if and wherein be equal to or less than the parity check protection level of the distribution of a described input traffic based on the minimum parity check protection level of the parity check submatrix of a described input traffic; then described each connection matrix is a null matrix, otherwise each connection matrix is non-null matrix.

The LDPC decoder can comprise one or more and long-pending decoder.

According to a sixth aspect of the invention, computer-readable data storage medium is provided, store on it and be used for indicating multiple-input and multiple-output (MIMO) system to carry out the computer code of handling the method for the data flow that receives at mimo system, described method comprises by a plurality of reception antenna receiving data streams; The data flow that receives is carried out the space-time decoding; The parity matrix that utilization is decoded to data stream, the data flow that receives is carried out low-density checksum (LDPC) decoding, wherein parity matrix comprises a plurality of parity check submatrixs, and the parity check submatrix is used for the receiving data stream receiving data stream relevant with each parity check submatrix encoded; Wherein the data flow that receives is carried out the LDPC decoding and comprise the one or more connection matrix of use; each connection matrix provides the information of a data flow in the data flow of reception so that another data flow in the data flow that receives is decoded; if and wherein be equal to or less than the parity check protection level of the distribution of a described input traffic based on the minimum parity check protection level of the parity check submatrix of a described input traffic; then described each connection matrix is a null matrix, otherwise each connection matrix is non-null matrix.

Description of drawings

Only by following example and description taken together with the accompanying drawings, those of ordinary skills can understand embodiments of the present invention better, and embodiments of the present invention will be more obvious to those of ordinary skills, wherein:

Fig. 1 is for broadly illustrating the schematic block diagram of the wireless communication system in exemplary enforcement;

Fig. 2 shows the schematic block diagram of reflector;

Fig. 3 shows the schematic block diagram of receiver;

Fig. 4 shows the block diagram of layering space-time (ST) low-density checksum (LDPC) cell encoder;

Fig. 5 shows the block diagram of ST LDPC iterative decoding unit;

Fig. 6 shows the hierarchy of the parity matrix of the LDPC sign indicating number that is used for encoder;

Fig. 7 shows the schematic diagram of example hierarchical LDPC sign indicating number;

Fig. 8 (a) is the exemplary parity matrix of the LDPC sign indicating number of Fig. 7;

Fig. 8 (b) is another exemplary parity matrix of the LDPC sign indicating number of Fig. 7;

Fig. 9 (a) illustrates the exemplary parity matrix of realizing the connection matrix create-rule to Fig. 9 (c);

Figure 10 shows the block diagram of modulation/sign map unit;

Figure 11 (a) to 11 (c) be I branch list/Q branch list, be used to illustrate logical signal mapping, and the combining of system/information and odd and even data;

Figure 12 is the flow chart of the method for the transfer of data in diagram multiple-input and multiple-output (MIMO) system;

Figure 13 is the flow chart of the method for the data flow that receives in multiple-input and multiple-output (MIMO) system of illustrated process;

Figure 14 is the schematic diagram that diagram realizes the protocol infrastructure of multimedia broadcasting and multicast service (MBMS) service.

Embodiment

Some part described below clearly or impliedly appears at algorithm and function or the symbolic representation aspect that the data in the computer storage are operated.These arthmetic statements and function or symbolic representation are the means that the technical staff of data processing field uses, most effectively their achievement is conveyed to others skilled in the art.Algorithm as referred to herein usually is considered to bring the self-congruent series of steps of expected results.The physical operations that those that these steps are physical quantitys need, for example, electricity, magnetic or light signal can be stored, transmit, make up, compare and other operation.

Unless specifically stated otherwise, otherwise, from following obviously as seen, be appreciated that by this specification, the discussion of terms such as utilization such as " browsing ", " calculating ", " judgement ", " substituting ", " generation ", " startup ", " output " refers to the behavior and the process of computing system or similar electronic equipment, and it operates and be converted into other data that are expressed as the physical quantity in computing system or out of Memory storage, transmission or the display device equally to the data that are expressed as the physical quantity in the computing system.

This specification also discloses the device of the operation that is used for manner of execution.These devices can be configured to required purposes especially, perhaps can comprise general purpose computer, perhaps by other device that is stored in the computer program selective activation in the computer or reconfigures.The algorithm that this paper occurs is not relevant with any certain computer or other device inherently.Various general purpose machines can be with using according to the program of this paper instruction.Alternatively, can construct more specific devices to carry out required method step.

In addition, this specification also impliedly discloses computer program, and for those skilled in the art clearly, each step of method described herein can realize by computer code.Computer program is not limited to any specific program language and execution thereof.Be appreciated that the instruction of the disclosure that multiple programming language and coding thereof can be used to realize that this paper comprises.In addition, computer program is not limited to any specific control flows.Do not deviating under aim of the present invention or the scope situation, multiple different computer program is arranged, it can use different control flows.

In addition, one or more steps of computer program can walk abreast rather than the order execution.Such computer program can be stored on any computer-readable medium.When computer program was loaded and moves on general purpose computer, it produced the device of the step that realizes method for optimizing effectively.

In order to set up MBMS service, normally, the MBMS context request of setting up that core network CN will be labeled as REQ sends to radio network controller, and (for example, RNC1), radio network controller (RNC) 1 return label is that response set up in the MBMS context of RESP.This request generally includes MBMS parameter, for example QoS.Radio network controller (RNC) 1 is set up the MBMS context for MBMS service separately in RNC then.RNC can set up the MBMS Data-carrying with CN before notification phase or after the notification phase.RNC determines usually how the MBMS service provides by network, and especially, the service of determining is to transmit from single subdistrict or a plurality of sub-district.

Figure 14 is the schematic diagram that illustrates the protocol infrastructure 1400 of realizing multimedia broadcasting and multicast service (MBMS) service.Protocol stack according to 3GPP generally includes a plurality of layers, from the physical layer PHY 1402 of expression signaling link, and medium access control (MAC) protocol layer 1404, Radio Link control (RLC) protocol layer 1406 and packet data convergence protocol (PDCP) layer 1408.The 3GPP protocol stack can comprise many other layers, and normally, only above-mentioned these layers are used for the transmission of MBMS service.

PDCP layer 1408 is present in the user plane from the service in PS territory.The service that PDCP provides can be called radio bearer, and PDCP provides the header-compressed service.PDCP compresses redundant protocol information when transmitting entity, and decompresses when receiving entity.PDCP also transmits the user data that receives with PDCP service data unit (SDUs) form from Non-Access Stratum, and they are forwarded to the RLC entity, and vice versa.

1406 couples of users of rlc layer and control data are carried out framing (framing) function, and it comprises and cutting apart/connects and fills function.Rlc layer 1406 provides to Radio Resource control (RRC) layer that is used for control data in control plane with to the application layer that is used for user data at user plane usually to be cut apart and relaying (retransmission) service.Rlc layer 1406 is realized variable-length higher layer protocol data unit (PDUs) is divided into less RLC PDUs usually, perhaps from less RLC PDUs reorganization variable-length higher layer protocol data units (PDUs) more.

Each RLC example of rlc layer 1406 can be set at by rrc layer and be operated in a kind of in following three kinds of patterns: transparent mode (TM), Unacknowledged Mode (UM) and affirmation mode (AM).Described three kinds of data-transmission modes are designated as the pattern of the RLC of logic channel setting.Transparent and Unacknowledged Mode RLC entity is defined as unidirectional, but the affirmation mode entity is two-way.

MAC layer 1404 is that the logic channel of feature provides service to rlc layer 1406 by the data type with transmission.MAC layer 1404 is with the logic channel mapping and be multiplexed to transmission channel.1404 identification of MAC layer are positioned at the subscriber equipment (UEs) on the common signal channel.MAC layer 1404 also is multiplexed as the transmission block that passes to physical layer 1402 with higher level PDUs on Common transport channel, perhaps the transmission block demultiplexing that will transmit from physical layer 1402 on Common transport channel is higher level PDUs.Usually can not finish in physical layer 1402 because service is multiplexed, so MAC is that Common transport channel processing service is multiplexed.When Common transport channel carrying during from the data of the logic channel of private type, the MAC head that is associated comprises the identifier of UE.MAC layer 1404 also is multiplexed as higher level PDUs the transmission block group that passes to physical layer 1402 on dedicated transmission channel, and the transmission block group demultiplexing that will transmit from physical layer 1402 on dedicated transmission channel be higher level PDUs.

Physical layer 1402 is connected to MAC layer 1404 by the transmission channel of carrier signaling information and user data.Physical layer 1402 provides service by transmission channel to MAC layer 1404, and how and with what described transmission channel is transmitted as feature with characteristic.Physical layer 1402 receives signaling and user data by physical channel on Radio Link.Physical layer 1402 is carried out multiplexed and chnnel coding usually, comprise Cyclic Redundancy Check calculating, forward error correction (FEC), rate-matched, interlaced transmission channels data and multiplexed transport channel data, and other physical layer procedures, such as collection, visit, calling and Radio Link foundation/fault.Physical layer 1402 can also be responsible for propagation and scrambling, modulation, measurement, transmit diversity, power weightings (power weighting), switching, compact model and power control.

CTCH Common Traffic Channel (CTCH) is the one-way channel that is present in the down link direction, and can be used when to all terminals or particular terminal pocket transmission information.Data-transmission mode uses the unidirectional common signal channel that does not have backward channel to be provided with usually.

At the left-hand side of Figure 14, being applied in of above-mentioned these layers controlled shown in the RNC 1410.In other words, RNC 1410 receives MBMS content 1412 and MBMS control signal 1414.MBMS content 1412 is handled in PDCP layer (that is, 1416).The data of encapsulation (packetised) are delivered to the datum plane 1418 of rlc layer 1406, and control signal is delivered to the control plane 1420 of rlc layer 1406 respectively.At rlc layer 1406, RLCPDUs is configured.In order to support MBMS data and control, MAC layer 1404 provides MBMS control channel MCCH (for example 1422) and MBMS Traffic Channel MTCH (for example 1424) to the base station of passing service.At MAC layer (that is, 1426), the MBMS service is from the logic channel mapping and be multiplexed to transmission channel.MAC layer 1404 and physical layer (that is, 1428) communication are so that transmission unit passes to mobile terminal UE 1430 with the MBMS service.

The right-hand side of Figure 14 illustrates the protocol layer that is equal in mobile terminal UE 1430.In this context, can think that Tx represents the transmitter side of the physical link between base station and the mobile terminal UE 1430, Rx is illustrated in the receiver side of the channel of mobile terminal UE 1430.Mobile terminal UE 1430 realizes MAC entity (that is, 1432), and MBMS control channel 1434 and MBMS Traffic Channel 1436 are provided, and those two channels that provide for control RNC1410 are provided two channels here.Rlc layer (that is, 1438) is responsible for and will be made up by the grouping of MAC entity transmission.Rlc layer (that is, 1440) is told the controlled function of label 1442.Final step, PDCP layer (that is, 1444) passes to the user with MBMS content 1446.

Exemplary enforcement can be provided for the technology of the signal processing in the physical layer of 3GPP protocol stack, transmission when supporting to have many content-datas of different B ERs.Described exemplary enforcement can realize in the radio MIMO system of any suitable setting.The radio communication of mimo system can meet any communication standard.

Fig. 1 is for broadly illustrating the schematic block diagram of the wireless communication system 100 in the exemplary enforcement.At reflector 102 places, source data (label 104) is by source encoder unit 106 coding, and interweaved by interleaver 108 and to be used for the information transmitted data with generation.The information data mode of piece (for example, with) sends to chnnel coding unit 110 to carry out chnnel coding and rate-matched.Coded data is sent to multiplexed unit 112 being a plurality of data flow with this data multiplex.Multiplexed data flow is sent to modulation and the data flow of map unit 114 produce to modulate.Tiao Zhi data flow is transmitted to receiver 118 by a plurality of transmitting antennas 116 then.

At receiver 118 places, the signal of emission is received by a plurality of reception antennas 120, and is sent to the signal that is received is detected and is the detecting unit 122 of a plurality of data flow that detected with the Signal Separation that is received.After testing data flow sent to be used for the demodulation mapping demodulation map unit 124 to produce demodulated data stream.Demodulated data stream is sent to dequantisation unit 126 being the data flow of a plurality of demultiplexings with the data demultiplexing.The data flow of demultiplexing is sent in the channel-decoding unit 128 to produce information data again.The information data that will produce again deinterleaves by the unit 130 that deinterleaves then, and sends to source decoder element 132 to recover the source data (label 134) of emission.

Fig. 2 shows the schematic block diagram of reflector 102.In exemplary enforcement, reflector 102 has adopted the source/channel coding schemes with various space-time treatment technologies, thinks that the data of different content provide unequal error protection (Unequal Error Protection).For example be divided into different brackets based on the requirement of for example quality and/or data rate corresponding to the input data (locating to receive) of MBMS service at one or more input blocks (label 104), that is the input data of the input data of higher priority and lower priority.For example, need the service of low BERs or service or the data that data are marked as higher priority, and on the other hand, can tolerate the service of high BERs or service or the data that data are marked as lower priority.

Grade also can based on but be not limited to message transmission rate, service quality (QoS) requirement, number of transmit antennas and launching condition.

M input traffic (locating to receive at one or more input unit (label 104)) with different priorities encoded by M source encoder (for example, 202,204).Can utilize unified encoding scheme or different encoding schemes that inlet flow is encoded.Source encoder (for example, 202,204) can be different or identical with any encoder well known by persons skilled in the art.The output of M source encoder (for example, 202,204) is sent to M interleaver unit (for example, 206,208) and interweaves.Interleaver unit (for example, 206,208) can be identical or different.

The data that interweave from interleaver unit (for example, 206,208) are transfused to layering ST LDPC coding unit 210.210 pairs of different priorities data with different yardage rates and/or different code word sizes of layering ST LDPC coding unit are encoded, and coded data is mapped to a plurality of (N _T) in the transmitting antenna stream.Be sent to N in data _TIndividual transmitting antenna (for example, 216,218) before, utilizes N _TIndividual modulation/symbol mapper unit (for example 212,214) is to being dispensed to N _TThe data of individual transmitting antenna stream are modulated/sign map.Modulation/symbol mapper unit (for example 212,214) utilizes various modulation schemes to carry out sign map about data.The dateout of modulation/symbol mapper unit (for example 212,214) is utilized N _TIndividual transmitting antenna (for example 216,218) is from reflector 102 emissions.

In sum, exemplary enforcement utilization comprises that the layering LDPC chnnel coding code of M layer encodes to the M level information data with different priorities.The chnnel coding code requires to encode to having different yardage rates and/or code word size every layer according to the protection of hope.The chnnel coding code will make up and be mapped to a plurality of transmitting antennas that have different diversity gains in spatial domain, time domain and/or frequency domain from the system/information data of M layer coded data with odd and even data then.

Different BER requires and the number of the available transmission antenna that is used to launch in order to be adapted to, and therefore the selection of source encoder (for example 202,204) and the design of layering ST LDPC coding unit 210 can change, with BER and/or the capacity that obtains to wish.Therefore, according to the qos requirement and the transmitting antenna information of input, provide the design of controller 220 with control hierarchy LDPC coding and spatial mappings.

Therefore, reflector 102 receives a plurality of input data sequences or stream, and wherein each data flow has been assigned with priority level or grade.The priority of each data flow is scheduled based on quality of service requirement.Reflector 102 is divided into a plurality of layers with input traffic, and the controller 220 of reflector 102 is every layer of assignment error protection level.But every layer yardage rate, code word size and minimum acceptance error protection level are defined as parameter, utilize this parameter of determining to generate parity matrix.Utilize the parity matrix that generates that the input data are encoded then.

Fig. 3 illustrates the schematic block diagram of receiver 118.At receiver 118 places, at a plurality of (N _R) receiver antenna (for example 302,304) a plurality of data sequences or the signal locating to receive at first be combined, and is applied to MIMO detector 306 then, to recover from the signal of reflector 102 (Fig. 2) emission.MIMO detector 306 can be worked with multiple mode well known by persons skilled in the art.An example is to use a plurality of the transmitting that arrives receiver antenna (for example, 302,304) by the Linear Estimation matrix of channel information structure with effective separation.Another embodiment is to use based on maximum likelihood method (ML) or maximum a posteriori probability (MAP) optimization Algorithm technology.In addition, least mean-square error (MMSE) and decision-feedback detection method can be used for MIMO detector 306 to reduce the complexity of system.

Signal by emitter antenna (for example, 216,218 (Fig. 2)) emission detects and is separated into N by MIMO detector 306 _TIndividual branch.To the separation signal in each branch, use demodulation separately/separate map unit (for example, 308,310) to carry out and separate mapping and demodulation operation.After separating mapping and demodulation, with N _TThe restituted signal of individual branch sends to ST LDPC iterative decoding unit 312, to produce the M layer signal again, wherein this M layer signal corresponding to from reflector 102 (with layering ST LDPC coding unit 210 relatively) the M level source code of emission and the data that interweave.

M channel-decoding data flow 312 outputs from ST LDPC iterative decoding unit, and utilize deinterleaver unit (for example, 314,316) to deinterleave.The interleaver unit of using in the reflector 102 (Fig. 2) (for example, 206,208 (Fig. 2)) is depended in the selection of deinterleaver unit (for example, 314,316).The data that deinterleave are sent to source decoder element (for example, 318,320), to produce M level source data again.The type of decoder element (for example, 318,320) depends on the source encoder unit (for example, 202,204 (Fig. 2)) that uses in the reflector 102 (Fig. 2).

At receiver 118 places,, provide the LDPC decoding of controller unit 322 with decoding of execution source and ST layering (comparing) with the controller 220 of reflector 102 according to the qos requirement and the transmitting antenna information of hope.

Fig. 4 is the block diagram that illustrates layering ST LDPC coding unit 210.Layering ST LDPC coding unit 210 comprises the LDPC encoder 402 and the spatial mappings unit 404 of layering.Input data (for example, at label 224,226 places) are at first encoded by the LDPC encoder 402 of layering.The LDPC encoder 402 of layering comprises the layer of M design, and every layer is used for every grade of input data with different yardage rates and different code word sizes are encoded.After coding, M coded data is sent to spatial mappings unit 404.404 pairs of M the data flow in spatial mappings unit are carried out multiplexed and/or the demultiplexing operation, and the mapping scheme according to design is mapped to a plurality of transmitting antenna streams with them then.

Fig. 5 is the block diagram that illustrates ST LDPC iterative decoding unit 312.ST LDPC iterative decoding unit 312 receives N _TIndividual input restituted signal (for example) at label 326,328 places, and, launch data with the M level that output produces again based on the coding execution decode operation of carrying out by the ST LDPC cell encoder 210 (Fig. 4) of layering.ST LDPC iterative decoding unit 312 comprises spatial mappings decoder 502, and M and the LDPC decoder of long-pending decoder (for example, 504,506,508) form being used for the M layer.The N of input _TIndividual data flow (for example, at label 326,328 places) is imported into spatial mappings decoder 502, and wherein spatial mappings decoder 502 is carried out and the opposite operation in spatial mappings unit 404 (Fig. 4).Therefore, N _TIndividual data flow is obtained M data flow by demultiplexing and/or multiplexed with the mapping scheme corresponding to the design of using with reference to figure 4.

M stream of decoding is from 502 outputs of spatial mappings decoder, and be input to M and long-pending decoder (for example, 504,506,508), make each and long-pending decoder (for example, 506) by input traffic being decoded from the information with long-pending decoder (for example, 504) of front.In other words, i and long-pending decoder receive i input traffic and from the 1st information to the result of (i-1) and long-pending decoder.Based on this information, the individual and long-pending decoder of i is carried out iteration and long-pending the decoding then, and to produce the i layer data again, wherein this i layer data is corresponding to the i level data with i priority.In exemplary enforcement, the decoding order is corresponding to the order of the coding of carrying out in layering ST LDPC coding unit 210 (Fig. 4).

Above-mentioned exemplary enforcement can provide unequal error protection to the different pieces of information with different priorities.ST LDPC coding, decoding and the spatial mappings technology of more detailed layering are provided in the following description.

Fig. 6 illustrates the hierarchy of the parity matrix 602 of the LDPC sign indicating number that uses in encoder 402 (Fig. 4).The LDPC sign indicating number can be by low-density parity check (LDPC) matrix H 602 expressions.Low-density parity check (LDPC) matrix H 602 is designed to the piecemeal lower triangular matrix.Matrix H 602 can be thought that the every layer data with different quality and/or rate requirement (for example, different yardage rates, different code word size and/or different check degree) realizes hierarchical coding by layering (seeing label 604).

As shown in Figure 6, parity check matrix H 602 is constructed to the M layer.For each i layer, provide submatrix H _i(for example, 606), this submatrix H _iIt can be parity check submatrix for each i layer information and executing son coding (sub-coding).These submatrixs are set on the diagonal of parity check matrix H 602.Also provide the continuous blocks that are associated with other layer C _{I, j}(j=i+1 ..., M) (for example, 610).Piece C _{I, j}Be set on the off-diagonal of parity check matrix H 602.Effectively binary code word b satisfies Hb ^T=0.For each different layers, corresponding submatrix Hi can have line number and the columns different with other submatrix.Therefore, code word b also is constructed to the M layer.Every layer of code word that can have different length of code word b, and the yardage rate of different layers can be different.In exemplary enforcement, Matrix C _{I, j}Represent the information relevant with j with link layer i.

Based on the characteristic of LDPC code, the position (perhaps variable node) with code word b of higher exponent number is better protected.In exemplary enforcement, connection matrix C _{I, j}(j=i+1 ..., M) can think to add exponent number to the position of i layer, make the position that is mapped to the i layer compare and be provided with better error protection with the position that is mapped to (i+1) layer.Therefore, layer from high to low (that is, corresponding to the mapped bits from the high priority to the low priority) from left to right being set up in parity check matrix H 602.In addition, because triangular structure under the standard of parity check matrix H 602, so the back end of higher-layer data has higher contact degree.

In exemplary enforcement; position from the M level is mapped to (that is, being encoded to) M layer respectively, and the order of order of priority (minimum from being up to) and layer (promptly; from layer 1 to layer M) identical so that adopt the unequal error protection characteristic of the LDPC sign indicating number of described layering.On the other hand, by each parity check submatrix H _iThe yardage rate that produces increases according to the order of layer; make the not coordination of different priorities (for example, minimum) encode with different yardage rates (for example, from minimum to the highest) from being up to; therefore can obtain different error protection ranks (for example, minimum) from being up to.Every layer code word size can require to adjust according to various error probabilities and/or transmission digit rate.

The code word size of supposing the i layer is n _i, and the number of parity check bit is r _iIn other words, parity check submatrix H _iBe that r is arranged _iRow and n _iThe matrix of row.For each layer, input information position s _i(n _i-r _i) the x1 vector is encoded as n _i* 1 code word.Coding to the 1st layer is as follows.By the execution conversion,

W ₁H ₁＝(P ₁I) (1)

Matrix W wherein ₁Be to matrix H ₁Carry out the r of conversion _i* r _iNon-singular matrix, P ₁Be r _i* (n _i-r _i) matrix, matrix I is r _i* r _jUnit matrix.In exemplary enforcement, conversion with to H ₁The Matrix of Linear of carrying out is represented relevant.The execution conversion makes and can obtain generator matrix P ₁Be used for coding.This operation is used for linear block encoding.It will be appreciated by those skilled in the art that LDPC is the form of linear block encoding.In sum, the 1st layer code word b ₁Constitute by following

b_{1} = (s_{1} (s_{1} P_{1}^{T})) - - - (2)

Therefore, linear block encoding is by parity check matrix H ₁Expression, generator matrix P ₁To s ₁Encode to produce parity bit.

For the i layer, similarly, by the execution conversion,

W _iH _i＝(P _iI) (3)

And the code word of i layer is made of following

b_{i} = (s_{i} (s_{i} P_{i}^{T} + \underset{j < i}{Σ} b_{j} C_{j, i}^{T} W_{i}^{T})) - - - (4)

During to i layer coding, the part of the information of the layer of forward direction is by connection matrix C _{J, i}(j=1 ..., i-1) be inserted in the code word of i layer.

In exemplary enforcement, to every layer decoding by carrying out by the order (that is, from layer 1 to layer M) of layer with long-pending method.In other words, it is at first decoded to improve decoding performance to have a higher-layer data of higher error protection.The parity check equations that is used for the 1st layer is

H_{1} b_{1}^{T} = 0 - - - (5)

When the iteration of the 1st layer decoder stops, satisfy equation (5).Therefore, the parity check equations of i layer is

\underset{j < i}{Σ} C_{j, i} b_{j}^{T} + H_{i} b_{i}^{T} = 0 - - - (6)

When the iteration of i layer decoder stops, satisfy equation (6).

During the LDPC decoding, when all parity check equations were satisfied, so-called belief propagation was terminated.In exemplary enforcement, about the parity check equations of the layer that detected and layer that will be detected when being satisfied, belief propagation is terminated when only.In other words, when the 1st to i parity check equations was satisfied, the belief propagation of i layer decoder was stopped.

In exemplary enforcement, except using belief propagation, decode procedure is iteration between each layer also.Iterative decoding between each layer can improve decoding performance gradually.In each such iteration,, carry out the message transmission from higher level (that is, receiving) and be used to verify parity check equations from the 1st to the i-1 layer for the i layer decoder.Also carry out the message transmission and be used to calculate log-likelihood ratio (LLR) from lower level (that is, sending to i+1 to the M layer).In exemplary enforcement, the message transmission of different directions (seeing 510 among Fig. 5,512) can provide faster and reliable decoding more between each layer.When all relevant parity check equations are satisfied (that is, put letter and be terminated) or when the convergence of LLRs was obtained, decode procedure was terminated.

Fig. 7 is the schematic diagram that illustrates the LDPC sign indicating number of example hierarchical.As describing purpose, suppose to have the information bit s of two grades ₁And s ₂The 1st grade of s ₁The position have higher priority and need better error protection, the 2nd grade of s ₂The position have lower priority and need less strong protection.The structure 702 of exemplary two-layer LDPC sign indicating number is shown in Figure 7.Matrix C 704 is the connection matrix between the 1st layer 706 and the 2nd layers 708.The 1st grade of s ₁The position by the 1st layer 706 of LDPC sign indicating number coding, the 2nd grade of s ₂The position by the 2nd layer 708 of LDPC sign indicating number coding.Therefore, the 1st layer the code word u that obtains (comparing with equation (2)) is as follows

u = (s_{1} (s_{1} P_{1}^{T})) - - - (7)

The 2nd layer the code word v that obtains (comparing with equation (4)) is as follows

v = (s_{2} (s_{2} P_{2}^{T} + u C^{T} W_{2}^{T})) - - - (8)

Fig. 8 (a) is the exemplary parity matrix 800 of the LDPC sign indicating number of Fig. 7.Because code word size is relevant with columns, therefore the 1st layer 802 code word size is 4.Because the number of parity bit is relevant with line number, therefore the number of the 1st layer 802 parity bit is 3.Therefore, based on code word size and odd even figure place, the information digit of the 1st layer of code word is 1.Therefore, the 1st layer 802 yardage rate is 1/4.Use identical reasoning, the 2nd layer 804 code word size is 4, and the 2nd layer 804 yardage rate is 1/2.Therefore, the 1st layer of code word is 4, comprises 1 information bit and 3 bit parity positions.The 2nd layer of code word is 4, comprises 2 information bits and 2 bit parity positions.That is to say,

The information bit parity bit

The information bit parity bit

Fig. 8 (b) is another exemplary parity matrix 806 of the LDPC sign indicating number of Fig. 7.In this embodiment, the 1st layer 808 yardage rate is that 1/4, the 2 layer 810 yardage rate is 1/2.The 1st layer 808 code word size is 8, and the 2nd layer 810 code word size is 4.Therefore, the 1st layer of code word is 8, comprises 2 information bits and 6 bit parity positions.The 2nd layer of code word is 4, comprises 2 information bits and 2 bit parity positions.That is to say,

The information bit parity bit

The information bit parity bit

In the above description, connection matrix is designed to add exponent number to higher level, thereby improves the protection to higher-layer data.Therefore, the structure of parity matrix (comprising subcode or parity check submatrix and connection matrix) can be used to control unequal error protection.

In the embodiment of Fig. 7, the generation of parity matrix 702 that is used for two-layer LDPC sign indicating number is as follows: consider the lowest error protection level of layer i, generate conventional LDPC subcode matrix H _i(r _i* n _i).According to the error probability requirement of each i layer data, select for example parameter of yardage rate, code word size and exponent number.The parameter of different layers can be identical or different.Generate layer C then _{I, j}(m * 1 matrix, m=r _j, 1=n _i) between connection matrix.This connection matrix is used for and will (for example, utilizes layer 2 coding of Fig. 7) in another the coding of one information of input traffic (for example, utilizing layer 1 coding of Fig. 7) in the insertion inlet flow.

The error protection rank and the lowest error protection level of the distribution of layer i are compared.If subcode H _i(comparing 710) and subcode H _j(comparing 712) can provide the protection that needs separately, then connection matrix C for each layer of embodiment among Fig. 7 _{I, j}(comparing 704) is generated as null matrix.Therefore, connection matrix C _{I, j}Inoperative to the 1st layer (comparing 706) and the 2nd layer (comparing 708).On the other hand, if subcode H _i(comparing 710) and subcode H _j(comparing 712) can not provide the protection that needs separately, then connection matrix C for each layer of embodiment among Fig. 7 _{I, j}(comparing 704) is generated as non-null matrix.

In other words; to compare based on the mistake or the parity check protection level of the distribution of the lowest error of the parity check submatrix of the input traffic that is associated (for example, utilizing parity check submatrix 710 coding of Fig. 7) (for example 710) or parity check protection level and described input traffic.If the error protection rank of distributing equals (perhaps being lower than) lowest error protection level based on the parity check submatrix, then connection matrix C _{I, j}It is null matrix.If the error protection that distributes is superior to the lowest error protection level, then connection matrix C _{I, j}It is non-null matrix.Therefore, if connection matrix C _{I, j}Be null matrix, then the protection level that is provided by the subcode separately of parity matrix is the lowest error protection level.

If the 1st layer of more protections of needs, then non-zero C _{I, j}Can give subcode H _iAdd exponent number, provide better protection to give the 1st layer data.In order to obtain suitable LDPC sign indicating number, parity matrix is not circulation in factor graph.Just, the design parity matrix makes does not have two row to share element " 1 " in two specific row.Therefore, connection matrix C _{I, j}Can be by following design.

If the error protection rank of the layer i that distributes is higher 1 grade than lowest error protection level, then give subcode H _iAdd 1 rank, connection matrix C _{I, j}Can be generated as

C ⁽¹⁾＝[I _m|I _m|…|I _m] (13)

Equation (13) is

Inferior unit matrix I _mCascade.Pass through mark

C ₁＝C ⁽¹⁾[:，1:l] (14)

Connection matrix can be chosen as C ' _{I, j}=C ₁

If the error protection rank of the layer i that distributes is higher 2 grades than lowest error protection level, add 2 rank, connection matrix C then for subcode Hi _{I, j}Can generate

I wherein _m ^(t)Represent each I _mThe t that moves to left row.

Pass through mark

C ₂＝C ⁽²⁾[:，1:l] (16)

Connection matrix can be chosen as C ' _{I, j}=C ₁+ C ₂

If the error protection level of the layer i that distributes is then given subcode H than the high k level of lowest error protected level _iAdd k rank (wherein k is little more a lot of than m), connection matrix C _{I, j}Can be generated as

I wherein _m ^(j)Represent each I _mThe j that moves to left row.

Pass through mark

C _k＝C ^(k)[:，1:l] (18)

Connection matrix can be chosen as C ' _{I, j}=C ₁+ C ₂+ ... + C _k

As final step, connection matrix C _{I, j}By with C ' _{I, j}Moving down (i-1) row obtains.

The exemplary parity matrix 900 of Fig. 9 (a) connection matrix create-rule above 9 (c) illustrate realization.Two-layer parity matrix 900 is equipped with the 1st layer 902 and the 2nd layers 904.For the 1st layer 902, the yardage rate is 1/3, and corresponding subcode H ₁The 906th, the exponent number of row is 8 * 12 matrixes on 3 rank.For the 2nd layer 904, the yardage rate is 1/2, and corresponding subcode H ₂The 908th, the exponent number of row is 6 * 12 matrixes on 2 rank.Connection matrix C 910 is null matrix of 6 * 12.

Fig. 9 (a) shows the connection matrix C 910 into null matrix.Therefore, by subcode H ₁906 and subcode H ₂908 protection levels separately that provide are minimal protection ranks of the 1st layer 902 and the 2nd layers 904 separately.

In order to give the 1st layer 902 to add 1 rank so that better protection to be provided, parity check matrix H 900 can change shown in Fig. 9 (b).Connection matrix C 910 is changed and is non-zero Matrix C 912.Non-zero Matrix C 912 obtains from Matrix C 910 based on equation (13) and equation (14).

Add 2 rank so that better protection to be provided in order to give the 1st layer 902, parity check matrix H 900 can change shown in Fig. 9 (c).Connection matrix C 912 is changed and is connection matrix C 914.Connection matrix C 914 compares with connection matrix C 912 and comprises more " 1 " element.Connection matrix C 914 obtains from Matrix C 912 based on equation (15) and equation (16).

It will be understood by those skilled in the art that in order to become sparse matrix, parity matrix 900 can be very big in actual applications.

Figure 10 is the block diagram that illustrates modulation/sign map unit 212 (Fig. 2).Other modulation/sign map unit (for example, 214) is basic identical with the function of modulation/sign map unit 212.The input data at label 228 places are utilized in the modulation scheme of aspect homophase and the quadrature phase component input data being modulated by modulator 1002 and are modulated different subclass with the emission data.Provide antenna processing device 1004 to be set to antenna emission stream (at label 1010 places) with data with I branch 1006 and Q branch 1008.Antenna processing device 1004 can be provided for the signal of the quadrature (perhaps near quadrature) of the transmit diversity in the wireless transmission and propagate.

It will be understood by those skilled in the art that the demodulation map operation that demodulation/separate map unit 308,310 (Fig. 3) is carried out is the opposite processing of above-mentioned modulation and map operation.

Figure 11 (a) to 11 (c) be I branch/

Q branch list

1102,1104,1106,1108,1110,1112,1114 and 1116, be used to illustrate the embodiment of the combination of logical signal mapping and system/information and odd and even data.Spatial mappings can be mapped to N with M layer coded data _TIn (antenna number) individual emission stream.Use signal map form described below, the position of every layer data is assigned in the symbol as much as possible, to obtain the upper frequency diversity.

Utilize modulation/sign map unit 212 (Figure 10), provide the signal map form M level information bit is mapped to (QPSK) N that modulates that has Quadrature Phase Shift Keying _TIndividual emission stream.In Figure 11 (a), the LDPC sign indicating number of signal map form and Fig. 8 (a) is united use so that (that is, M=2) a level information bit is mapped to (that is N, with two _T=2) two antenna emission streams.In Figure 11 (b), the LDPC sign indicating number of another kind of signal map form and Fig. 8 (b) is united use so that (that is, M=2) a level information bit is mapped to (that is NT=2) two antennas emission streams, with two.In Figure 11 (c), also have the LDPC sign indicating number of another kind of signal map form and Fig. 8 (b) to unite use so that (that is, M=2) a level information bit is mapped to (that is NT=4) four antennas emission streams, with two.

Utilize Figure 11 (a) and the illustrated signal map form of Figure 11 (b), the information bit of grade 1 and some parity bit, and the information bit of grade 2 is mapped to the 1st antenna emission stream (element of table 1102 with equation (9) and (10) compared, and the element of table 1106 with equation (11) and (12) compared).The remaining parity bit of grade 1 and the parity bit of grade 2 are mapped to the 2nd antenna emission stream (element of table 1104 with equation (9) and (10) compared, and the element of table 1108 with equation (11) and (12) compared).By realizing the signal map form, this two level is dispensed in each symbol, to obtain to be used for the upper frequency diversity of OFDM (OFDM) emission.Shown in above-mentioned embodiment; for the 1st grade of data with higher priority provide better error protection (for example, more parity bits), in the embodiment shown in Figure 11 (a); the 2nd grade of data with lower priority have obtained higher emission digit rate and (that is, have launched v in an emission ₁(1), v ₂(1) to v ₁(4), v ₂(4)).The emission of code word subsequently is according to above-mentioned signal map form.

With reference to the signal map form shown in Figure 11 (c), the 1st layer information bit and some parity bit, and the 2nd layer information bit and parity bit are mapped to the symbols streams by the emission of the 1st and the 2nd antenna.The 1st layer of remaining parity bit, and the 2nd layer information bit and parity bit are mapped to the symbols streams by the emission of the 3rd and the 4th antenna.(table 1110,1112,1114,1116 that relatively has the element of equation (11) and (12)).As describing purpose, the symbol of Figure 11 (a) to (c) is given as: u _i' (k) or v _i' (k), wherein i is from the i position in the subcode word of one deck, k is the index of subcode word.Utilize illustrated signal map form, will be distributed in each symbol from the two-layer position of having encoded, to obtain to be used for the upper frequency diversity of OFDM emission.By with four transmitting antenna (N shown in Figure 11 (c) _T=4) signal map form and Figure 11 (a) and (b) shown in two transmitting antenna (N _T=2) signal map form compares, and the signal map form can be shown follow identical principle.Described principle is that the signal from every layer is propagated into available transmitting antenna with the acquisition space diversity, and propagates into available subcarrier to obtain frequency diversity under OFDM emission situation.

Shown in Figure 11 (a) to (c), for the data with higher priority provide error protection preferably, the data with lower priority can obtain the higher transmit digit rate.

Figure 12 is the flow chart 1200 of the method for the transfer of data in multiple-input and multiple-output (MIMO) system.In step 1202, receive a plurality of input traffics.In step 1204; utilize parity matrix to carry out low-density checksum (LDPC) coding of input traffic; wherein parity matrix comprises a plurality of parity check submatrixs; the parity check submatrix is encoded to each autocorrelative one in the input traffic and is generated one or more connection matrix; each connection matrix is inserted into one information in the input traffic in another the coding in the input traffic; if and wherein be equal to or less than the parity check protection level of one distribution in the described input traffic based on the minimum parity check protection level of one parity check submatrix in the described input traffic; then described each connection matrix is a null matrix, otherwise each connection matrix is non-null matrix.In step 1206, carry out space-time code through the input traffic of LDPC coding by emission on a plurality of antennas.

Figure 13 is the flow chart 1300 that illustrates the method for handling the data flow that receives in multiple-input and multiple-output (MIMO) system.In step 1302, by a plurality of reception antenna receiving data streams.In step 1304, the data flow that receives is carried out the space-time decoding.In step 1306; utilize parity matrix that the data flow that receives is carried out low-density checksum (LDPC) decoding; wherein parity matrix comprises a plurality of parity check submatrixs; the parity check submatrix is decoded to each autocorrelative one in the data flow that receives and is used one or more connection matrix; each connection matrix provides one information in the data flow of reception; be used for another of the data flow that receives decoded; if and wherein be equal to or less than the parity check protection level of one distribution in the described input traffic based on the minimum parity check protection level of one parity check submatrix in the described input traffic; then described each connection matrix is a null matrix, otherwise each connection matrix is non-null matrix.

More than exemplary enforcement can provide different error protections for transmitting and receiving many content-datas (for example, MBMS service) in the wireless communication system.The physical layer that described exemplary enforcement can be used to broadcast with multicast service is launched.The unequal error protection that transmits in the time of difference MBMS can provide by adopting LDPC coding and space-time to handle, and can realize in any radio MIMO system.The quality of error protection and the requirement of data rate can realize with different space-time mapping schemes by the LDPC hierarchy that utilization is used for the different priorities data.

More than exemplary enforcement association system can be provided, it supports the various error protection requirements of (for example, 3GPP MBMS) in the high speed data transfers system simultaneously with high system flexibility and low implementation complexity.The transmission digit rate of service and being provided with of robustness of protection can be jointly controlled by layering LDPC encoder and space-time mapper; described layering LDPC encoder can have the different pieces of information of different priorities with different yardage rates, code word size and the distribution of verification degree, and described space-time mapper can be handled for different pieces of information provide different space-times.

Having admitted various channel coding schemes and space-time treatment technology can be to because the distortion of decay and the transmission data that cause of noise provides the protection of different stage, and can obtain the data transmission rate of different stage.By using encoding scheme and space-time treatment technology, stronger transmission is provided for the data of higher priority, and can provides the higher transmission digit rate to low priority data.In addition,, further protection can be obtained, capacity can be increased simultaneously by using above exemplary enforcement.

In addition, can be by the hierarchy different protections that support has the service/data of different priorities with the space-time mapping scheme of design LDPC sign indicating number.In above exemplary enforcement, the different yardage rates of different pieces of information and/or code word size can obtain by the LDPC parity matrix (layer is corresponding to priority) of design layering.In addition, obtain by the signal map of distributing than high diversity in spatial domain, time domain and the frequency domain.Can and be mapped as data by multiplexed/demultiplexing and carry out space-time mapping in the described exemplary enforcement, think that different information datas realize various space-time codes with different priorities.

In above exemplary enforcement, different content data (perhaps having the difference service that different error probabilities require) with different priorities are handled according to the LDPC channel coding schemes of layering, and can have different yardage rates and/or different code word size to each layer corresponding to the different priorities data.Information and odd and even data can and be mapped to a plurality of antenna emission streams by multiplexed/demultiplexing.Multiplexed and mapping can be controlled the space-time code structure that is applied to the different content data, and therefore can provide different protections and/or transmission digit rate to the different content data.

It will be appreciated by those skilled in the art that not deviating under the general aim of describing of the present invention or scope, can carry out many changes and/or modification the present invention as shown in specific implementations.Therefore, present embodiment can be thought and is illustrative in all respects and is not restrictive.

Claims

1. the method for the transfer of data in a multiple-input and multiple-output (MIMO) system, described method comprises:

Receive a plurality of input traffics;

Utilize parity matrix that described input traffic is carried out low-density checksum (LDPC) coding, wherein said parity matrix comprises a plurality of parity check submatrixs, described parity check submatrix is used for the described input traffic input traffic relevant with each parity check submatrix encoded, and

Carry out the input traffic of space-time code to encode through LDPC by a plurality of antenna emissions;

Wherein, described input traffic is carried out the LDPC coding comprise the one or more connection matrix of generation, each connection matrix is used for the information of an input traffic of described input traffic is inserted in the coding of another input traffic in the described input traffic, and

Wherein, if the minimum parity check protection level based on the parity check submatrix of a described input traffic is equal to or less than the parity check protection level that a described input traffic distributes; then described each connection matrix is a null matrix, otherwise described each connection matrix is non-null matrix.

2. method according to claim 1, wherein said a plurality of input traffics comprise M inlet flow of M different brackets, and described parity matrix has the M layer, and every layer of described parity matrix corresponding to a grade in the described M grade.

3. method according to claim 1 and 2, wherein each connection matrix links two-layer in the described M layer, makes described relevant information between two-layer be inserted into during described LDPC coding.

4. according to any described method in the claim 1 to 4, wherein for each connection matrix, if the parity check protection level of being distributed than the high k level of minimum parity check protection level, then described each connection matrix generates by following steps:

Matrix is provided

M=r wherein _i, l=n _i, r _iBe the figure place of the parity check bit of a described input traffic, n _i, be the code word size of a described input traffic, I _m ^(t)Be unit matrix I _mThe shift left operation of t row;

Mark C _k=C ^(k)[:, 1:l];

Mark C ' _{I, j}=C ₁+ C ₂++ C _kAnd

With C ' _{I, j}Move down (i-1) row and obtain described each connection matrix.

5. according to any described method in the claim 1 to 4, wherein said parity matrix is the piecemeal lower triangular matrix, and described parity check submatrix is positioned on the leading diagonal of described parity matrix as piece.

6. method according to claim 5, wherein said connection matrix is positioned at below the leading diagonal of described parity matrix as piece, and the piece above leading diagonal is a null matrix.

7. the reflector in input and output more than a kind (MIMO) system, described reflector comprises:

One or more input unit, it receives a plurality of input traffics;

Low-density checksum (LDPC) encoder;

The spatial mappings unit;

Wherein, described LDPC encoder utilizes parity matrix that described input traffic is carried out the LDPC coding, and described parity matrix comprises a plurality of parity check submatrixs, described parity check submatrix is used for the described input traffic input traffic relevant with each parity check submatrix encoded, and space-time code is carried out to launch described input traffic through the LDPC coding by a plurality of antennas in described spatial mappings unit;

Wherein, for described input traffic being carried out the LDPC coding, described LDPC encoder generates one or more connection matrix, each connection matrix is used for the information of an input traffic of described input traffic is inserted in the coding of another input traffic in the described input traffic, and

Wherein, if be equal to or less than the parity check protection level of the distribution of a described input traffic based on the minimum parity check protection level of the parity check submatrix of a described input traffic; then described each connection matrix is a null matrix, otherwise described each connection matrix is non-null matrix.

8. reflector according to claim 7, wherein said a plurality of input traffics comprise M inlet flow of M different brackets, and described parity matrix has the M layer, and every layer of described parity matrix corresponding to a grade in the described M grade.

9. according to claim 7 or 8 described reflectors, wherein each connection matrix links the two-layer of described M layer, makes described relevant information between two-layer be inserted into during described LDPC coding.

10. according to any described reflector in the claim 7 to 9; wherein for each connection matrix; if the parity check protection level of being distributed is than the high k level of minimum parity check protection level, then described LDPC encoder generates described each connection matrix by following steps:

Matrix is provided

Mark C _k=C ^(k)[:, 1:l];

Mark C ' _{I, j}=C ₁+ C ₂++ C _kAnd

11. according to any described reflector in the claim 7 to 10, wherein said parity matrix is the piecemeal lower triangular matrix, described parity check submatrix is positioned on the leading diagonal of described parity matrix as piece.

12. reflector according to claim 11, wherein said connection matrix is positioned at below the leading diagonal of described parity matrix as piece, and the piece above leading diagonal is a null matrix.

13. a computer-readable data storage medium stores on it and is used for indicating multiple-input and multiple-output (MIMO) system to carry out the computer code of the data transmission method of mimo system, described method comprises:

Receive a plurality of input traffics;

Carry out space-time code, with the input traffic of encoding through LDPC by a plurality of antenna emissions;

14. a method that is used for handling the data flow that multiple-input and multiple-output (MIMO) system receives, described method comprises:

By a plurality of reception antenna receiving data streams;

The data flow that is received is carried out the space-time decoding; And

Utilization is used for parity matrix that described data flow is decoded, carry out low-density checksum (LDPC) decoding of the data flow of described reception, wherein said parity matrix comprises a plurality of parity check submatrixs, and described parity check submatrix is used for the described receiving data stream receiving data stream relevant with each parity check submatrix encoded;

Wherein, the LDPC decoding of carrying out the data flow of described reception comprises uses one or more connection matrix, each connection matrix provides the information of a data flow in the data flow of described reception to be used for another data flow of the data flow of described reception is decoded, and

15. method according to claim 14 also comprises and adopting and long-pending method is decoded to the data flow of described reception.

16. the receiver in a multiple-input and multiple-output (MIMO) system, described receiver comprises:

A plurality of reception antennas, receiving data stream;

The spatial mappings decoder is carried out the space-time decoding to the data flow of described reception; And

Low-density checksum (LDPC) decoder, it utilizes the parity matrix that described data flow is decoded that the data flow of described reception is decoded, wherein said parity matrix comprises a plurality of parity check submatrixs, and described parity check submatrix is used for the described receiving data stream receiving data stream relevant with each parity check submatrix encoded;

Wherein, LDPC decoding for the data flow of carrying out described reception, described LDPC decoder uses one or more connection matrix, each connection matrix is used for providing the information of a data flow of data flow of described reception so that another data flow in the data flow of described reception is decoded, and

17. receiver according to claim 16, wherein said LDPC decoder comprise one or more and long-pending decoder.

18. a computer-readable data storage medium stores on it and is used for indicating multiple-input and multiple-output (MIMO) system to carry out the computer code of handling the method for the data flow that receives at mimo system, described method comprises:

By a plurality of reception antenna receiving data streams;

The data flow of described reception is carried out the space-time decoding; And

The parity matrix that utilization is decoded to described data flow is carried out low-density checksum (LDPC) decoding to the data flow of described reception, wherein said parity matrix comprises a plurality of parity check submatrixs, and described parity check submatrix is used for the described receiving data stream receiving data stream relevant with each parity check submatrix encoded;

Wherein, the data flow of described reception is carried out the LDPC decoding comprise the one or more connection matrix of use, the information that each connection matrix provides a data flow in the data flow of described reception to be decoding to another data flow in the data flow of described reception, and